* Added a color to GameModeInfo for menus when they draw selectable big text items.
* Fully support skill specification for all managed missions
* New DOOM 2 expansions menu that is built dynamically, and only appears if one or more managed mission packs are configured. No longer specific to BFG Edition.
* Resources added to eternity.pke for new menu. They are *not* the same as the ones in the BFG IWAD - particularly, I fixed the text kerning and stray gray pixels, the W in Which, and capitalized E in Expansion.

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2485 86ba831e-150c-0410-ab35-e06eaae15ed9